Product Detail

S Series

Quick Overview


NFPA Interchangeable

Max Operating Pressure: 150 PSI (10 bar)
Bore Size: 1.5 to 8 in (38 to 203 mm)

The S Series is a stainless steel NFPA Interchangeable pneumatic cylinder line. It is designed and built to perform in the toughest “wash down” applications. The stainless steel construction provides outstanding corrosion resistance while including a multitude of favorable design features. The S Series encompasses many of the same proven design features as our original NFPA Interchangeable cylinder, the A Series. This includes an extra long bushing and a standard oversized wear band located on the rear of the piston. Additionally, Numatics has also included the proven T Seal piston seal configuration with carboxilated nitrile with self-lubricating PTFE compound. These are just a few of the features that make the S Series the superior stainless steel NFPA interchangeable air cylinder line.

Standard Specifications

  • Meets NFPA specifications
  • Bore sizes - 1-1/2” to 8” (38 to 203 mm)
  • Piston rod diameters - 5/8” to 1-3/4” (16 to 44 mm)
  • Maximum pressure rating - 150 PSI air (10 bar)
  • Standard temperature - -10 to +165 °F (-23 to +74 °C)
  • All stainless steel construction, except piston (aluminum)
  • NPTF ports
  • Flexible port and cushion location


The 316 stainless steel tube provides smooth, corrosion free operation.

End Caps

The end caps are accurately machined from precision 316 stainless steel blocks. Additionally, a recess on the piston-mating surface (at both ends) enables the air to work on a larger piston area for effortless breakaway.

Rod Bushing

The S Series includes a cutting edge PolyLube™ composite rod bushing that is extra long in length. The composite rod bushing is specifically designed for applications where corrosion, low friction, and excellent wear characteristics are desired.

Rod Seal

The carboxilated nitrile with PTFE compound rod seal is self-lubricating and durable. The rounded lip design ensures proper sealing and long life.

Rod Wiper

The standard rod wiper construction is a highly durable polyurethane.

Piston Rod

The piston rod is machined from 303 stainless steel and is turned, ground, polished, and has a chrome plated surface. This surface provides maximum life for both the rod bushing and the seals.

Bushing Retainer

The bushing retainer is machined from highly corrosion resistant 304 stainless steel bar stock. Additionally, it is a full-face design. This is to minimize corners and crevices. It enables the cylinder to perform in food grade applications.

Tie Rods

The tie rods are drawn and ground 303 high strength stainless steel. The tie rod threads are rolled for superior strength and engagement. Furthermore, the tie rods are secured with 304 stainless steel acorn nuts. This eliminates exposed threads. Again, enabling the S Series cylinder to perform in food grade application.

Piston Seal

The piston seal is a carboxilated nitrile with PTFE compound for self-lubrication. The “T” seal with back-up ring construction prevents rolling and seals at all pressures.

Wear Band

The wear band is a stable, lubricating strip located on the piston. Numatics separated the load bearing points by locating the wear band at the rear of the piston. This maximizes column strength at full extension.


The solid aluminum alloy piston is strong and durable.

Cushion Seal

The floating cushion seal design enables rapid stroke reversal by providing instantaneous full flow to the piston. Each cushion has a flush, retained adjustment needle.

Tube End Seal

The tube end seals are compression type and reusable.


Numatics' enhanced port design enables the cylinder to work more efficiently. Through the use of precise machining depths and tool shape, Numatics is able to smooth the flow path into and out of the cylinder.

Product Specifications